This list contains useful software that's been battle proven in my environment and is worthy enough to be included. Since lots of people asked me about what I use, I decided to compile this list. Thank you and contributions are always welcome.
Chocolatey is a package manager for Windows. It's the basis of all my Windows installs and integrates super easily with PowerShell. One click, and your new machine is set up. Also very easy to integrate into Active Directory environment, thanks to PowerShell, again.
ungoogled-chromium is a fork of Chromium but with all of Google functionality replaced by placeholders. This is the browser I'm using daily. It has a slight problem with that you need to install every extension via 'developer mode', because on my machines it won't install packed extensions.
Also, to install extensions from Chrome Store, you'll need NeverDecaf/chromium-web-store. For everything else about it, see the FAQ.
KeePassXC has been a staple of my software collection for many years. It's a password manager that has very strong security, integrates into browsers easily and supports YubiKeys. Highly recommended.
Rainmeter is a tool that can completely transform your desktop into whatever you want it to look like. Personally I use it for simple clock/weather/music player integrations. The skins that I use are:
mRemoteNG is an all-in-one remote management console supporting every possible protocol you can think of. SSH, RDP, VNC, ICA... it has it all!
Also, good support for integrating third-party applications into its window, like the PowerShell ISE or AnyDesk.
To use YubiKey SSH authentication effectively, you need a version of SSH agent that supports it. Previously I used gpg-agent, but now I switched to PageantSC since it's way more robust.
It's paid for non-FOSS users, but since YubiKey implements OpenPGP Smartcard, you can request a free license, or just pay 1 EUR to its creator if you can't wait :). Absolutely the best drop-in replacement for PuTTY Pageant.
AnyDesk is a very good alternative to tools like TeamViewer, etc. Especially the TV which keeps pestering you with that commercial use popup as soon as it thinks that your PCs use the same network addressing -- oooh, that must be a business, right, since no ordinary user can use routed networking?
Also, has auto-discovery, and generally very good flow.